Minor repairs are an important step in prolonging transmission/transaxle life expectancy. A minor repair is any work that has to be done externally without removal of transmission/transaxle assembly.
Some of the services offered are:
External Seals and Gaskets
Transaxle CV Joints and Boots
Speed Sensors (Input, Output, Vehicle Speed, Turbine, etc.)
Neutral Safety Switches or Reverse Light Switches
Valve Body Recalibration Kits
As you can see, there are a number of external components that can be repaired without removal of the transmission assembly. A malfunction of any of these components can and will affect the operation of your automatic transmission.